3rd vote for maintenance. If the rig doesn't stop (most important), steer (2nd most important) or go (least important) then all it can do is sit there and look good. So make 100% sure the maintenance is done, else when you have to do an emergency stop and a original brake line blows and you plow into Whatever, it won't matter that you've got the "sickest" rims ever seen. You can have some serious pucker moments when the rear drums are soaked in gear oil too...
So, check the brakes (pads, disks, drums, lines, fluid), and if you have ABS pull those sensors on the rear to check for fluid.
If brakes and tires are up to snuff, then the 2 BIG items are the lower ball joints (if you don't know for certain they have been replaced within the last 100k miles, they are due ~ the wheel falls off when they fail) and the radiator/transmission cooler is known to leak causing "pink milkshake" which will kill the transmission. Both are so well known you should just plan on addressing them right away (about $300 in parts).
Past that, my own '99 was transformed in a major way by replacing all the bushings. That's 16 between the control arms, 3 on the steering rack, 12 on the sway-bars.... thankfully my body bushings seem fine. I highly recommend doing this as 20 year old bushings are bound to be trash just due to age.
Then get the engine sorted with timing belt, water pump, plugs, wires, filters, etc... I have to do a valve cover gasket too as mine's leaking oil, like they all seem to do sooner or later.
Finally, get the fluids changed out.
THEN start thinking about your "sick modz", starting with shocks/springs.... the bumpers, sliders, winch, etc... are all worthless until the rig is ready to be used.
You may find that you need other things like CV boots, or a steering rack, in the process of Baselining the truck. I know, it's Boring stuff... no one sees any of it. But if you front-load the maintenance like this you'll never have to do a Ton of it all at once again, AND the vehicle will be RELIABLE from the start. Nevermind that it'll be safer and ride nicer. I try to mix in some "fun" stuff just to keep my motivation up... so I put in a different radio along the way, tinted the windows and have plans for different seats soon.
But that's just, like, my opinion... man.